NCP1280 Active Clamp Voltage Mode PWM Controller for Off-Line Applications The NCP1280 provides a highly integrated solution for off−line power supplies requiring high−efficiency and low parts count.
This voltage mode controller provides control outputs for driving a forward converter primary MOSFET and an auxiliary MOSFET for active clamp circuit.
The second output with its programmable delay can also be used for driving a synchronous rectifier on the secondary or for asymmetric half bridge circuits.
Incorporation of high voltage startup circuitry (with 700 V capability) reduces parts count and system power dissipation.
Additional features such as line UV/OV protection, soft−start, single...

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